Open navigation drawer by clicking the app icon

Question

I want to let my user open the navigation drawer by clicking the app icon. This is my code:

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_add);
    // Show the Up button in the action bar.

    DrawerLayout mDrawerLayout = (DrawerLayout) findViewById(R.id.left_drawer);
    ActionBarDrawerToggle mDrawerToggle = new ActionBarDrawerToggle(
            this,                  /* host Activity */
            mDrawerLayout, /* DrawerLayout object */
           R.drawable.ic_drawer,  /* nav drawer icon to replace 'Up' caret */
            R.string.drawer_open,  /* "open drawer" description */
            R.string.drawer_close  /* "close drawer" description */
            ) {

        /** Called when a drawer has settled in a completely closed state. */
        public void onDrawerClosed(View view) {
            getActionBar().setTitle(R.string.title_activity_add);
        }

        /** Called when a drawer has settled in a completely open state. */
        public void onDrawerOpened(View drawerView) {
            getActionBar().setTitle(R.string.drawer_title);
        }
    };


    mDrawerLayout.setDrawerListener(mDrawerToggle);
    getActionBar().setDisplayHomeAsUpEnabled(true); // Pressing the app icon in the action bar will navigate to the parent activity.
    getActionBar().setHomeButtonEnabled(true);

}

But when I tap the icon, nothing happens. Where is the problem.

Answer 1

Have a look here for an example of the docs. You need additional code in

• onPostCreate() to sync your Drawer state
• onOptionsItemSelected() to handle the touch event of the App icon

• onConfigurationChanged() to provide the new configuration to the drawer

  public class YourActivity extends Activity {
  
  public ActionBarDrawerToggle mDrawerToggle;
  
  @Override
  protected void onCreate(Bundle savedInstanceState) {
      ...
      mDrawerToggle = new ActionBarDrawerToggle();
      ...
  }
  
  @Override
  protected void onPostCreate(Bundle savedInstanceState) {
       super.onPostCreate(savedInstanceState);
       // Sync the toggle state after onRestoreInstanceState has occurred.
       mDrawerToggle.syncState();
  }
  
  @Override
  public void onConfigurationChanged(Configuration newConfig) {
      super.onConfigurationChanged(newConfig);
      mDrawerToggle.onConfigurationChanged(newConfig);
  }
  
  @Override
  public boolean onOptionsItemSelected(MenuItem item) {
       // Pass the event to ActionBarDrawerToggle, if it returns
       // true, then it has handled the app icon touch event
       if (mDrawerToggle.onOptionsItemSelected(item)) {
           return true;
       }
       // Handle your other action bar items...
  
       return super.onOptionsItemSelected(item);
  }
  
  }
  

Answer 2

You should override onOptionsItemSelected of the activity and use this:

@Override
    public boolean onOptionsItemSelected(MenuItem item) {

        if (mDrawerToggle.onOptionsItemSelected(item)) {
            return true;
        }
        return super.onOptionsItemSelected(item);
}